Santana should be able to tell you the year from the serial number. The marathon frame, Suntour friction barcons, Grab-Ons, and TA cranks indicate late 1970s to early 1980s. The rear hub brake looks somewhat like an Arai drum, not a disc.


Barely-relevant side comment: Grab-On still makes and sells handlebar grips (drop and flat bar) out of their Walla Walla factory / warehouse. I just bought a bunch for local nonprofits, at a price lower than Asian competition.